Add a new config parameter with a hard lower limit for word count.

[remlaps]

An author whitelist is available where the Thoth operator can exempt selected authors from some of the screening requirements, including the minimum word count. In theory, the LLM should still reject short posts that cannot be adequately summarized. That doesn't always happen, however.

Accordingly, a Thoth operator may want to create a separate minimum wordcount that doesn't get ignored for whitelisted authors.